<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
	<style type="text/css">
		.triangle{
			width: 0px;
			height: 0px;
			border-color: transparent red blue yellow;
            border-width: 100px ;
            border-style: solid ;
		}
	</style>
</head>
<body>
      <div class="triangle"></div>
</body>
</html>